Add unit test infrastructure

tests/xua_unit_tests/src/test_hid/test_hid.xc

@@ -0,0 +1,7 @@
+// Copyright 2021 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+#include "xua_unit_tests.h"
+
+void test_null(){
+    TEST_ASSERT_MESSAGE(1, "Success!");
+}

tests/xua_unit_tests/src/xua_unit_tests.h

@@ -0,0 +1,25 @@
+// Copyright 2018-2021 XMOS LIMITED.
+// This Software is subject to the terms of the XMOS Public Licence: Version 1.
+#ifndef VTB_UNIT_TESTS_H_
+#define VTB_UNIT_TESTS_H_
+
+#include "unity.h"
+
+#ifdef __XC__
+
+#include <xs1.h>
+#include <string.h>
+#include <math.h>
+
+#include <xclib.h>
+
+#include "audio_test_tools.h"
+#include "voice_toolbox.h"
+#include "voice_toolbox_fp.h"
+#include "vtb_references.h"
+
+#define TEST_ASM 1
+
+#endif // __XC__
+
+#endif /* VTB_UNIT_TESTS_H_ */